Use ModelWithCreatedUpdatedFields for Profile model

this adds the fields `created_at`, `created_by`, `updated_at` and `updated_by`

profile/models.py

@@ -20,19 +20,15 @@
 from django.contrib.auth.models import User
 from django.db import models
 from django.utils.translation import gettext_lazy as _
+from program.models import ModelWithCreatedUpdatedFields
 
 
-class Profile(models.Model):
+class Profile(ModelWithCreatedUpdatedFields, models.Model):
     user = models.OneToOneField(
         User, on_delete=models.CASCADE, related_name="profile", editable=False
     )
     cba_username = models.CharField(_("CBA Username"), blank=True, max_length=60)
     cba_user_token = models.CharField(_("CBA Token"), blank=True, max_length=255)
-    # FIXME: these fields should be from an abstract model
-    created_at = models.DateTimeField(auto_now_add=True)
-    created_by = models.CharField(max_length=150)
-    updated_at = models.DateTimeField(auto_now=True)
-    updated_by = models.CharField(max_length=150)
 
     def __str__(self):
         return self.user.username